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Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method

A concrete structure, embedded technology, applied in building construction, building maintenance, construction and other directions, can solve the problem of weakening carbon fiber slats, FRP sheet accidental wear, impact, fire, and high requirements for the flatness of the concrete bonding interface. Achieve the effect of reducing wear, convenient construction and low flatness

Inactive Publication Date: 2016-09-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the method of externally pasting FRP sheets to strengthen concrete structures has many advantages, it also has the following disadvantages: 1. FRP sheets are easy to peel off from the concrete paste interface, and it is difficult to exert the strength of FRP sheets; 2. Requirements for the smoothness of the concrete paste interface High; 3. The FRP sheet pasted on the outer surface of the component is vulnerable to accidents (such as abrasion, impact, fire) and harsh environments (such as high temperature, high humidity and freeze-thaw)
However, opening holes in the carbon fiber slats will weaken the carbon fiber slats on the one hand, and on the other hand, cannot significantly improve the strength utilization and reinforcement efficiency of the carbon fiber slats

Method used

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  • Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method
  • Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method
  • Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Such as Figure 1-4 , Picture 9 As shown, this embodiment provides the use of embedded wet-bonded FRP strips for bending reinforcement of the reinforced concrete structure 1, and the implementation steps include:

[0061] (1) A trench 2 is opened on the bottom surface of the concrete structure 1 to be reinforced. The trench 2 has a depth of 25 mm and a width of 12 mm. (2) Rinse the groove 2 with high-pressure water, and after the groove 2 is left to dry for at least one day, blow it with an air pump with a pressure of about 1.7 MPa to ensure that the groove 2 is clean and dry. (3) Use a glue gun to inject the adhesive into the groove 2, and the dosage is limited to a slight overflow of the groove. (4) Brush the surface of the FRP strip 3 with an adhesive that is the same as or compatible with the adhesive poured in the groove 2 and make it brush to fully wet the FRP strip 3. (5) Except for anchoring or adapting to the surface shape of the structure, the FRP strip 3 shoul...

Embodiment 2

[0063] Such as Figure 5-8 , Picture 9 As shown, this embodiment provides the use of embedded wet-bonded FRP strips for shear reinforcement of the reinforced concrete structure 1, and the implementation steps include:

[0064] (1) A number of trenches 2 are opened on the surface (including the ground, top and side surfaces) of the concrete structure 1 to be reinforced. The trenches 2 are 25mm deep and 12mm wide. The bottom trenches 2 or When the top groove 2 transitions to the side groove 2, a circular arc with a radius of 25 mm is used for transition. (2) Rinse the groove 2 with high-pressure water, and blow the groove 2 with an air pump with an air pressure of about 1.7 MPa after being dried for at least one day to ensure that the groove 2 is clean and dry. (3) Use a glue gun to inject the adhesive into the groove 2, and the dosage is limited to a slight overflow of the groove. (4) Brush the surface of the FRP strip 3 with an infiltrating adhesive that is the same as or compa...

Embodiment 3

[0066] This embodiment provides a component obtained by using the reinforcement method of the first embodiment. Such as Figure 1-4 , Picture 9 As shown, it includes a concrete structure 1 and an FRP strip 3. A groove 2 is provided on the surface of the concrete structure 1. The groove 2 is embedded with an FRP strip 3, and the FRP strip 3 is bonded The agent is embedded in the groove 1, the FRP strip 3 is woven from long fiber filaments, and the cross section of the FRP strip 3 is rectangular. Among them, the concrete structure 1 has a clear span of 4000 mm, a cross-sectional height of 450 mm, and a cross-sectional width of 200 mm. The FRP strip 3 has a thickness of 4 mm and a width of 25 mm, and the groove 2 has a width of 12 mm.

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Abstract

The invention discloses a method for reinforcing a concrete structure with embedded wet-bonded FRP strips and components thereof, comprising the following steps: (1) opening at least one groove on the surface of the concrete structure to be reinforced; (2) removing concrete impurities in the groove (3) pouring adhesive in the groove; (4) using adhesive to brush and fully infiltrate the FRP strip; (5) embedding the FRP strip to the groove; (6 ) After the FRP strip is fully embedded in the groove, remove excess adhesive on the groove; (7) Naturally maintain the concrete structure. The component is formed by bending or shearing the existing concrete structure with embedded wet-bonded FRP strips, including the existing concrete structure and at least one wet-bonded FRP strip. The invention uses embedded wet-bonded FRP strips to strengthen the concrete structure under bending or shearing. The wet-bonded FRP strips can adapt to the direction change requirements of FRP materials according to different reinforcement requirements, thereby limiting or slowing down the occurrence of peeling damage and improving the performance of FRP materials. The utilization rate and reinforcement effect.

Description

Technical field [0001] The present invention relates to the technical field of concrete structure reinforcement, in particular, to a method for reinforcing concrete structures with embedded wet-bonded FRP strips and components thereof. Background technique [0002] Fiber Reinforced Polymer / Plastic (FRP) has excellent properties such as high strength, light weight, strong corrosion resistance, and ability to block electromagnetic radiation. It is widely used in the reinforcement of concrete structures. Externally pasted or embedded FRP sheets are the current common methods for applying FRP to strengthen concrete structures. [0003] Although the method of externally attaching FRP sheets to strengthen concrete structures has many advantages, it also has the following disadvantages: 1. FRP sheets are easy to peel from the concrete bonding interface, and it is difficult to exert the strength of FRP sheets; 2. The flatness requirements of the concrete bonding interface High; 3. The FRP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02
CPCE04G23/02E04G2023/0251
Inventor 付兵方舒李丽娟刘锋谢建和
Owner GUANGDONG UNIV OF TECH
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